drivers/ieee1394/nodemgr.c

   1 /*
   2  * Node information (ConfigROM) collection and management.
   3  *
   4  * Copyright (C) 2000           Andreas E. Bombe
   5  *               2001-2003      Ben Collins <bcollins@debian.net>
   6  *
   7  * This code is licensed under the GPL.  See the file COPYING in the root
   8  * directory of the kernel sources for details.
   9  */
  10
  11 #include <linux/bitmap.h>
  12 #include <linux/kernel.h>
  13 #include <linux/list.h>
  14 #include <linux/slab.h>
  15 #include <linux/delay.h>
  16 #include <linux/kthread.h>
  17 #include <linux/module.h>
  18 #include <linux/moduleparam.h>
  19 #include <linux/freezer.h>
  20 #include <asm/atomic.h>
  21
  22 #include "csr.h"
  23 #include "highlevel.h"
  24 #include "hosts.h"
  25 #include "ieee1394.h"
  26 #include "ieee1394_core.h"
  27 #include "ieee1394_hotplug.h"
  28 #include "ieee1394_types.h"
  29 #include "ieee1394_transactions.h"
  30 #include "nodemgr.h"
  31
  32 static int ignore_drivers;
  33 module_param(ignore_drivers, int, S_IRUGO | S_IWUSR);
  34 MODULE_PARM_DESC(ignore_drivers, "Disable automatic probing for drivers.");
  35
  36 struct nodemgr_csr_info {
  37         struct hpsb_host *host;
  38         nodeid_t nodeid;
  39         unsigned int generation;
  40         unsigned int speed_unverified:1;
  41 };
  42
  43
  44 /*
  45  * Correct the speed map entry.  This is necessary
  46  *  - for nodes with link speed < phy speed,
  47  *  - for 1394b nodes with negotiated phy port speed < IEEE1394_SPEED_MAX.
  48  * A possible speed is determined by trial and error, using quadlet reads.
  49  */
  50 static int nodemgr_check_speed(struct nodemgr_csr_info *ci, u64 addr,
  51                                quadlet_t *buffer)
  52 {
  53         quadlet_t q;
  54         u8 i, *speed, old_speed, good_speed;
  55         int error;
  56
  57         speed = &(ci->host->speed[NODEID_TO_NODE(ci->nodeid)]);
  58         old_speed = *speed;
  59         good_speed = IEEE1394_SPEED_MAX + 1;
  60
  61         /* Try every speed from S100 to old_speed.
  62          * If we did it the other way around, a too low speed could be caught
  63          * if the retry succeeded for some other reason, e.g. because the link
  64          * just finished its initialization. */
  65         for (i = IEEE1394_SPEED_100; i <= old_speed; i++) {
  66                 *speed = i;
  67                 error = hpsb_read(ci->host, ci->nodeid, ci->generation, addr,
  68                                   &q, sizeof(quadlet_t));
  69                 if (error)
  70                         break;
  71                 *buffer = q;
  72                 good_speed = i;
  73         }
  74         if (good_speed <= IEEE1394_SPEED_MAX) {
  75                 HPSB_DEBUG("Speed probe of node " NODE_BUS_FMT " yields %s",
  76                            NODE_BUS_ARGS(ci->host, ci->nodeid),
  77                            hpsb_speedto_str[good_speed]);
  78                 *speed = good_speed;
  79                 ci->speed_unverified = 0;
  80                 return 0;
  81         }
  82         *speed = old_speed;
  83         return error;
  84 }
  85
  86 static int nodemgr_bus_read(struct csr1212_csr *csr, u64 addr, u16 length,
  87                             void *buffer, void *__ci)
  88 {
  89         struct nodemgr_csr_info *ci = (struct nodemgr_csr_info*)__ci;
  90         int i, error;
  91
  92         for (i = 1; ; i++) {
  93                 error = hpsb_read(ci->host, ci->nodeid, ci->generation, addr,
  94                                   buffer, length);
  95                 if (!error) {
  96                         ci->speed_unverified = 0;
  97                         break;
  98                 }
  99                 /* Give up after 3rd failure. */
 100                 if (i == 3)
 101                         break;
 102
 103                 /* The ieee1394_core guessed the node's speed capability from
 104                  * the self ID.  Check whether a lower speed works. */
 105                 if (ci->speed_unverified && length == sizeof(quadlet_t)) {
 106                         error = nodemgr_check_speed(ci, addr, buffer);
 107                         if (!error)
 108                                 break;
 109                 }
 110                 if (msleep_interruptible(334))
 111                         return -EINTR;
 112         }
 113         return error;
 114 }
 115
 116 static int nodemgr_get_max_rom(quadlet_t *bus_info_data, void *__ci)
 117 {
 118         return (CSR1212_BE32_TO_CPU(bus_info_data[2]) >> 8) & 0x3;
 119 }
 120
 121 static struct csr1212_bus_ops nodemgr_csr_ops = {
 122         .bus_read =     nodemgr_bus_read,
 123         .get_max_rom =  nodemgr_get_max_rom
 124 };
 125
 126
 127 /*
 128  * Basically what we do here is start off retrieving the bus_info block.
 129  * From there will fill in some info about the node, verify it is of IEEE
 130  * 1394 type, and that the crc checks out ok. After that we start off with
 131  * the root directory, and subdirectories. To do this, we retrieve the
 132  * quadlet header for a directory, find out the length, and retrieve the
 133  * complete directory entry (be it a leaf or a directory). We then process
 134  * it and add the info to our structure for that particular node.
 135  *
 136  * We verify CRC's along the way for each directory/block/leaf. The entire
 137  * node structure is generic, and simply stores the information in a way
 138  * that's easy to parse by the protocol interface.
 139  */
 140
 141 /*
 142  * The nodemgr relies heavily on the Driver Model for device callbacks and
 143  * driver/device mappings. The old nodemgr used to handle all this itself,
 144  * but now we are much simpler because of the LDM.
 145  */
 146
 147 static DEFINE_MUTEX(nodemgr_serialize);
 148
 149 struct host_info {
 150         struct hpsb_host *host;
 151         struct list_head list;
 152         struct task_struct *thread;
 153 };
 154
 155 static int nodemgr_bus_match(struct device * dev, struct device_driver * drv);
 156 static int nodemgr_uevent(struct class_device *cdev, char **envp, int num_envp,
 157                           char *buffer, int buffer_size);
 158 static void nodemgr_resume_ne(struct node_entry *ne);
 159 static void nodemgr_remove_ne(struct node_entry *ne);
 160 static struct node_entry *find_entry_by_guid(u64 guid);
 161
 162 struct bus_type ieee1394_bus_type = {
 163         .name           = "ieee1394",
 164         .match          = nodemgr_bus_match,
 165 };
 166
 167 static void host_cls_release(struct class_device *class_dev)
 168 {
 169         put_device(&container_of((class_dev), struct hpsb_host, class_dev)->device);
 170 }
 171
 172 struct class hpsb_host_class = {
 173         .name           = "ieee1394_host",
 174         .release        = host_cls_release,
 175 };
 176
 177 static void ne_cls_release(struct class_device *class_dev)
 178 {
 179         put_device(&container_of((class_dev), struct node_entry, class_dev)->device);
 180 }
 181
 182 static struct class nodemgr_ne_class = {
 183         .name           = "ieee1394_node",
 184         .release        = ne_cls_release,
 185 };
 186
 187 static void ud_cls_release(struct class_device *class_dev)
 188 {
 189         put_device(&container_of((class_dev), struct unit_directory, class_dev)->device);
 190 }
 191
 192 /* The name here is only so that unit directory hotplug works with old
 193  * style hotplug, which only ever did unit directories anyway. */
 194 static struct class nodemgr_ud_class = {
 195         .name           = "ieee1394",
 196         .release        = ud_cls_release,
 197         .uevent         = nodemgr_uevent,
 198 };
 199
 200 static struct hpsb_highlevel nodemgr_highlevel;
 201
 202
 203 static void nodemgr_release_ud(struct device *dev)
 204 {
 205         struct unit_directory *ud = container_of(dev, struct unit_directory, device);
 206
 207         if (ud->vendor_name_kv)
 208                 csr1212_release_keyval(ud->vendor_name_kv);
 209         if (ud->model_name_kv)
 210                 csr1212_release_keyval(ud->model_name_kv);
 211
 212         kfree(ud);
 213 }
 214
 215 static void nodemgr_release_ne(struct device *dev)
 216 {
 217         struct node_entry *ne = container_of(dev, struct node_entry, device);
 218
 219         if (ne->vendor_name_kv)
 220                 csr1212_release_keyval(ne->vendor_name_kv);
 221
 222         kfree(ne);
 223 }
 224
 225
 226 static void nodemgr_release_host(struct device *dev)
 227 {
 228         struct hpsb_host *host = container_of(dev, struct hpsb_host, device);
 229
 230         csr1212_destroy_csr(host->csr.rom);
 231
 232         kfree(host);
 233 }
 234
 235 static int nodemgr_ud_platform_data;
 236
 237 static struct device nodemgr_dev_template_ud = {
 238         .bus            = &ieee1394_bus_type,
 239         .release        = nodemgr_release_ud,
 240         .platform_data  = &nodemgr_ud_platform_data,
 241 };
 242
 243 static struct device nodemgr_dev_template_ne = {
 244         .bus            = &ieee1394_bus_type,
 245         .release        = nodemgr_release_ne,
 246 };
 247
 248 /* This dummy driver prevents the host devices from being scanned. We have no
 249  * useful drivers for them yet, and there would be a deadlock possible if the
 250  * driver core scans the host device while the host's low-level driver (i.e.
 251  * the host's parent device) is being removed. */
 252 static struct device_driver nodemgr_mid_layer_driver = {
 253         .bus            = &ieee1394_bus_type,
 254         .name           = "nodemgr",
 255         .owner          = THIS_MODULE,
 256 };
 257
 258 struct device nodemgr_dev_template_host = {
 259         .bus            = &ieee1394_bus_type,
 260         .release        = nodemgr_release_host,
 261         .driver         = &nodemgr_mid_layer_driver,
 262 };
 263
 264
 265 #define fw_attr(class, class_type, field, type, format_string)          \
 266 static ssize_t fw_show_##class##_##field (struct device *dev, struct device_attribute *attr, char *buf)\
 267 {                                                                       \
 268         class_type *class;                                              \
 269         class = container_of(dev, class_type, device);                  \
 270         return sprintf(buf, format_string, (type)class->field);         \
 271 }                                                                       \
 272 static struct device_attribute dev_attr_##class##_##field = {           \
 273         .attr = {.name = __stringify(field), .mode = S_IRUGO },         \
 274         .show   = fw_show_##class##_##field,                            \
 275 };
 276
 277 #define fw_attr_td(class, class_type, td_kv)                            \
 278 static ssize_t fw_show_##class##_##td_kv (struct device *dev, struct device_attribute *attr, char *buf)\
 279 {                                                                       \
 280         int len;                                                        \
 281         class_type *class = container_of(dev, class_type, device);      \
 282         len = (class->td_kv->value.leaf.len - 2) * sizeof(quadlet_t);   \
 283         memcpy(buf,                                                     \
 284                CSR1212_TEXTUAL_DESCRIPTOR_LEAF_DATA(class->td_kv),      \
 285                len);                                                    \
 286         while ((buf + len - 1) == '\0')                                 \
 287                 len--;                                                  \
 288         buf[len++] = '\n';                                              \
 289         buf[len] = '\0';                                                \
 290         return len;                                                     \
 291 }                                                                       \
 292 static struct device_attribute dev_attr_##class##_##td_kv = {           \
 293         .attr = {.name = __stringify(td_kv), .mode = S_IRUGO },         \
 294         .show   = fw_show_##class##_##td_kv,                            \
 295 };
 296
 297
 298 #define fw_drv_attr(field, type, format_string)                 \
 299 static ssize_t fw_drv_show_##field (struct device_driver *drv, char *buf) \
 300 {                                                               \
 301         struct hpsb_protocol_driver *driver;                    \
 302         driver = container_of(drv, struct hpsb_protocol_driver, driver); \
 303         return sprintf(buf, format_string, (type)driver->field);\
 304 }                                                               \
 305 static struct driver_attribute driver_attr_drv_##field = {      \
 306         .attr = {.name = __stringify(field), .mode = S_IRUGO }, \
 307         .show   = fw_drv_show_##field,                          \
 308 };
 309
 310
 311 static ssize_t fw_show_ne_bus_options(struct device *dev, struct device_attribute *attr, char *buf)
 312 {
 313         struct node_entry *ne = container_of(dev, struct node_entry, device);
 314
 315         return sprintf(buf, "IRMC(%d) CMC(%d) ISC(%d) BMC(%d) PMC(%d) GEN(%d) "
 316                        "LSPD(%d) MAX_REC(%d) MAX_ROM(%d) CYC_CLK_ACC(%d)\n",
 317                        ne->busopt.irmc,
 318                        ne->busopt.cmc, ne->busopt.isc, ne->busopt.bmc,
 319                        ne->busopt.pmc, ne->busopt.generation, ne->busopt.lnkspd,
 320                        ne->busopt.max_rec,
 321                        ne->busopt.max_rom,
 322                        ne->busopt.cyc_clk_acc);
 323 }
 324 static DEVICE_ATTR(bus_options,S_IRUGO,fw_show_ne_bus_options,NULL);
 325
 326
 327 #ifdef HPSB_DEBUG_TLABELS
 328 static ssize_t fw_show_ne_tlabels_free(struct device *dev,
 329                                        struct device_attribute *attr, char *buf)
 330 {
 331         struct node_entry *ne = container_of(dev, struct node_entry, device);
 332         unsigned long flags;
 333         unsigned long *tp = ne->host->tl_pool[NODEID_TO_NODE(ne->nodeid)].map;
 334         int tf;
 335
 336         spin_lock_irqsave(&hpsb_tlabel_lock, flags);
 337         tf = 64 - bitmap_weight(tp, 64);
 338         spin_unlock_irqrestore(&hpsb_tlabel_lock, flags);
 339
 340         return sprintf(buf, "%d\n", tf);
 341 }
 342 static DEVICE_ATTR(tlabels_free,S_IRUGO,fw_show_ne_tlabels_free,NULL);
 343
 344
 345 static ssize_t fw_show_ne_tlabels_mask(struct device *dev,
 346                                        struct device_attribute *attr, char *buf)
 347 {
 348         struct node_entry *ne = container_of(dev, struct node_entry, device);
 349         unsigned long flags;
 350         unsigned long *tp = ne->host->tl_pool[NODEID_TO_NODE(ne->nodeid)].map;
 351         u64 tm;
 352
 353         spin_lock_irqsave(&hpsb_tlabel_lock, flags);
 354 #if (BITS_PER_LONG <= 32)
 355         tm = ((u64)tp[0] << 32) + tp[1];
 356 #else
 357         tm = tp[0];
 358 #endif
 359         spin_unlock_irqrestore(&hpsb_tlabel_lock, flags);
 360
 361         return sprintf(buf, "0x%016llx\n", (unsigned long long)tm);
 362 }
 363 static DEVICE_ATTR(tlabels_mask, S_IRUGO, fw_show_ne_tlabels_mask, NULL);
 364 #endif /* HPSB_DEBUG_TLABELS */
 365
 366
 367 static ssize_t fw_set_ignore_driver(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 368 {
 369         struct unit_directory *ud = container_of(dev, struct unit_directory, device);
 370         int state = simple_strtoul(buf, NULL, 10);
 371
 372         if (state == 1) {
 373                 ud->ignore_driver = 1;
 374                 down_write(&ieee1394_bus_type.subsys.rwsem);
 375                 device_release_driver(dev);
 376                 up_write(&ieee1394_bus_type.subsys.rwsem);
 377         } else if (state == 0)
 378                 ud->ignore_driver = 0;
 379
 380         return count;
 381 }
 382 static ssize_t fw_get_ignore_driver(struct device *dev, struct device_attribute *attr, char *buf)
 383 {
 384         struct unit_directory *ud = container_of(dev, struct unit_directory, device);
 385
 386         return sprintf(buf, "%d\n", ud->ignore_driver);
 387 }
 388 static DEVICE_ATTR(ignore_driver, S_IWUSR | S_IRUGO, fw_get_ignore_driver, fw_set_ignore_driver);
 389
 390
 391 static ssize_t fw_set_destroy_node(struct bus_type *bus, const char *buf, size_t count)
 392 {
 393         struct node_entry *ne;
 394         u64 guid = (u64)simple_strtoull(buf, NULL, 16);
 395
 396         ne = find_entry_by_guid(guid);
 397
 398         if (ne == NULL || !ne->in_limbo)
 399                 return -EINVAL;
 400
 401         nodemgr_remove_ne(ne);
 402
 403         return count;
 404 }
 405 static ssize_t fw_get_destroy_node(struct bus_type *bus, char *buf)
 406 {
 407         return sprintf(buf, "You can destroy in_limbo nodes by writing their GUID to this file\n");
 408 }
 409 static BUS_ATTR(destroy_node, S_IWUSR | S_IRUGO, fw_get_destroy_node, fw_set_destroy_node);
 410
 411
 412 static ssize_t fw_set_rescan(struct bus_type *bus, const char *buf,
 413                              size_t count)
 414 {
 415         int error = 0;
 416
 417         if (simple_strtoul(buf, NULL, 10) == 1)
 418                 error = bus_rescan_devices(&ieee1394_bus_type);
 419         return error ? error : count;
 420 }
 421 static ssize_t fw_get_rescan(struct bus_type *bus, char *buf)
 422 {
 423         return sprintf(buf, "You can force a rescan of the bus for "
 424                         "drivers by writing a 1 to this file\n");
 425 }
 426 static BUS_ATTR(rescan, S_IWUSR | S_IRUGO, fw_get_rescan, fw_set_rescan);
 427
 428
 429 static ssize_t fw_set_ignore_drivers(struct bus_type *bus, const char *buf, size_t count)
 430 {
 431         int state = simple_strtoul(buf, NULL, 10);
 432
 433         if (state == 1)
 434                 ignore_drivers = 1;
 435         else if (state == 0)
 436                 ignore_drivers = 0;
 437
 438         return count;
 439 }
 440 static ssize_t fw_get_ignore_drivers(struct bus_type *bus, char *buf)
 441 {
 442         return sprintf(buf, "%d\n", ignore_drivers);
 443 }
 444 static BUS_ATTR(ignore_drivers, S_IWUSR | S_IRUGO, fw_get_ignore_drivers, fw_set_ignore_drivers);
 445
 446
 447 struct bus_attribute *const fw_bus_attrs[] = {
 448         &bus_attr_destroy_node,
 449         &bus_attr_rescan,
 450         &bus_attr_ignore_drivers,
 451         NULL
 452 };
 453
 454
 455 fw_attr(ne, struct node_entry, capabilities, unsigned int, "0x%06x\n")
 456 fw_attr(ne, struct node_entry, nodeid, unsigned int, "0x%04x\n")
 457
 458 fw_attr(ne, struct node_entry, vendor_id, unsigned int, "0x%06x\n")
 459 fw_attr_td(ne, struct node_entry, vendor_name_kv)
 460
 461 fw_attr(ne, struct node_entry, guid, unsigned long long, "0x%016Lx\n")
 462 fw_attr(ne, struct node_entry, guid_vendor_id, unsigned int, "0x%06x\n")
 463 fw_attr(ne, struct node_entry, in_limbo, int, "%d\n");
 464
 465 static struct device_attribute *const fw_ne_attrs[] = {
 466         &dev_attr_ne_guid,
 467         &dev_attr_ne_guid_vendor_id,
 468         &dev_attr_ne_capabilities,
 469         &dev_attr_ne_vendor_id,
 470         &dev_attr_ne_nodeid,
 471         &dev_attr_bus_options,
 472 #ifdef HPSB_DEBUG_TLABELS
 473         &dev_attr_tlabels_free,
 474         &dev_attr_tlabels_mask,
 475 #endif
 476 };
 477
 478
 479
 480 fw_attr(ud, struct unit_directory, address, unsigned long long, "0x%016Lx\n")
 481 fw_attr(ud, struct unit_directory, length, int, "%d\n")
 482 /* These are all dependent on the value being provided */
 483 fw_attr(ud, struct unit_directory, vendor_id, unsigned int, "0x%06x\n")
 484 fw_attr(ud, struct unit_directory, model_id, unsigned int, "0x%06x\n")
 485 fw_attr(ud, struct unit_directory, specifier_id, unsigned int, "0x%06x\n")
 486 fw_attr(ud, struct unit_directory, version, unsigned int, "0x%06x\n")
 487 fw_attr_td(ud, struct unit_directory, vendor_name_kv)
 488 fw_attr_td(ud, struct unit_directory, model_name_kv)
 489
 490 static struct device_attribute *const fw_ud_attrs[] = {
 491         &dev_attr_ud_address,
 492         &dev_attr_ud_length,
 493         &dev_attr_ignore_driver,
 494 };
 495
 496
 497 fw_attr(host, struct hpsb_host, node_count, int, "%d\n")
 498 fw_attr(host, struct hpsb_host, selfid_count, int, "%d\n")
 499 fw_attr(host, struct hpsb_host, nodes_active, int, "%d\n")
 500 fw_attr(host, struct hpsb_host, in_bus_reset, int, "%d\n")
 501 fw_attr(host, struct hpsb_host, is_root, int, "%d\n")
 502 fw_attr(host, struct hpsb_host, is_cycmst, int, "%d\n")
 503 fw_attr(host, struct hpsb_host, is_irm, int, "%d\n")
 504 fw_attr(host, struct hpsb_host, is_busmgr, int, "%d\n")
 505
 506 static struct device_attribute *const fw_host_attrs[] = {
 507         &dev_attr_host_node_count,
 508         &dev_attr_host_selfid_count,
 509         &dev_attr_host_nodes_active,
 510         &dev_attr_host_in_bus_reset,
 511         &dev_attr_host_is_root,
 512         &dev_attr_host_is_cycmst,
 513         &dev_attr_host_is_irm,
 514         &dev_attr_host_is_busmgr,
 515 };
 516
 517
 518 static ssize_t fw_show_drv_device_ids(struct device_driver *drv, char *buf)
 519 {
 520         struct hpsb_protocol_driver *driver;
 521         struct ieee1394_device_id *id;
 522         int length = 0;
 523         char *scratch = buf;
 524
 525         driver = container_of(drv, struct hpsb_protocol_driver, driver);
 526
 527         for (id = driver->id_table; id->match_flags != 0; id++) {
 528                 int need_coma = 0;
 529
 530                 if (id->match_flags & IEEE1394_MATCH_VENDOR_ID) {
 531                         length += sprintf(scratch, "vendor_id=0x%06x", id->vendor_id);
 532                         scratch = buf + length;
 533                         need_coma++;
 534                 }
 535
 536                 if (id->match_flags & IEEE1394_MATCH_MODEL_ID) {
 537                         length += sprintf(scratch, "%smodel_id=0x%06x",
 538                                           need_coma++ ? "," : "",
 539                                           id->model_id);
 540                         scratch = buf + length;
 541                 }
 542
 543                 if (id->match_flags & IEEE1394_MATCH_SPECIFIER_ID) {
 544                         length += sprintf(scratch, "%sspecifier_id=0x%06x",
 545                                           need_coma++ ? "," : "",
 546                                           id->specifier_id);
 547                         scratch = buf + length;
 548                 }
 549
 550                 if (id->match_flags & IEEE1394_MATCH_VERSION) {
 551                         length += sprintf(scratch, "%sversion=0x%06x",
 552                                           need_coma++ ? "," : "",
 553                                           id->version);
 554                         scratch = buf + length;
 555                 }
 556
 557                 if (need_coma) {
 558                         *scratch++ = '\n';
 559                         length++;
 560                 }
 561         }
 562
 563         return length;
 564 }
 565 static DRIVER_ATTR(device_ids,S_IRUGO,fw_show_drv_device_ids,NULL);
 566
 567
 568 fw_drv_attr(name, const char *, "%s\n")
 569
 570 static struct driver_attribute *const fw_drv_attrs[] = {
 571         &driver_attr_drv_name,
 572         &driver_attr_device_ids,
 573 };
 574
 575
 576 static void nodemgr_create_drv_files(struct hpsb_protocol_driver *driver)
 577 {
 578         struct device_driver *drv = &driver->driver;
 579         int i;
 580
 581         for (i = 0; i < ARRAY_SIZE(fw_drv_attrs); i++)
 582                 if (driver_create_file(drv, fw_drv_attrs[i]))
 583                         goto fail;
 584         return;
 585 fail:
 586         HPSB_ERR("Failed to add sysfs attribute for driver %s", driver->name);
 587 }
 588
 589
 590 static void nodemgr_remove_drv_files(struct hpsb_protocol_driver *driver)
 591 {
 592         struct device_driver *drv = &driver->driver;
 593         int i;
 594
 595         for (i = 0; i < ARRAY_SIZE(fw_drv_attrs); i++)
 596                 driver_remove_file(drv, fw_drv_attrs[i]);
 597 }
 598
 599
 600 static void nodemgr_create_ne_dev_files(struct node_entry *ne)
 601 {
 602         struct device *dev = &ne->device;
 603         int i;
 604
 605         for (i = 0; i < ARRAY_SIZE(fw_ne_attrs); i++)
 606                 if (device_create_file(dev, fw_ne_attrs[i]))
 607                         goto fail;
 608         return;
 609 fail:
 610         HPSB_ERR("Failed to add sysfs attribute for node %016Lx",
 611                  (unsigned long long)ne->guid);
 612 }
 613
 614
 615 static void nodemgr_create_host_dev_files(struct hpsb_host *host)
 616 {
 617         struct device *dev = &host->device;
 618         int i;
 619
 620         for (i = 0; i < ARRAY_SIZE(fw_host_attrs); i++)
 621                 if (device_create_file(dev, fw_host_attrs[i]))
 622                         goto fail;
 623         return;
 624 fail:
 625         HPSB_ERR("Failed to add sysfs attribute for host %d", host->id);
 626 }
 627
 628
 629 static struct node_entry *find_entry_by_nodeid(struct hpsb_host *host,
 630                                                nodeid_t nodeid);
 631
 632 static void nodemgr_update_host_dev_links(struct hpsb_host *host)
 633 {
 634         struct device *dev = &host->device;
 635         struct node_entry *ne;
 636
 637         sysfs_remove_link(&dev->kobj, "irm_id");
 638         sysfs_remove_link(&dev->kobj, "busmgr_id");
 639         sysfs_remove_link(&dev->kobj, "host_id");
 640
 641         if ((ne = find_entry_by_nodeid(host, host->irm_id)) &&
 642             sysfs_create_link(&dev->kobj, &ne->device.kobj, "irm_id"))
 643                 goto fail;
 644         if ((ne = find_entry_by_nodeid(host, host->busmgr_id)) &&
 645             sysfs_create_link(&dev->kobj, &ne->device.kobj, "busmgr_id"))
 646                 goto fail;
 647         if ((ne = find_entry_by_nodeid(host, host->node_id)) &&
 648             sysfs_create_link(&dev->kobj, &ne->device.kobj, "host_id"))
 649                 goto fail;
 650         return;
 651 fail:
 652         HPSB_ERR("Failed to update sysfs attributes for host %d", host->id);
 653 }
 654
 655 static void nodemgr_create_ud_dev_files(struct unit_directory *ud)
 656 {
 657         struct device *dev = &ud->device;
 658         int i;
 659
 660         for (i = 0; i < ARRAY_SIZE(fw_ud_attrs); i++)
 661                 if (device_create_file(dev, fw_ud_attrs[i]))
 662                         goto fail;
 663         if (ud->flags & UNIT_DIRECTORY_SPECIFIER_ID)
 664                 if (device_create_file(dev, &dev_attr_ud_specifier_id))
 665                         goto fail;
 666         if (ud->flags & UNIT_DIRECTORY_VERSION)
 667                 if (device_create_file(dev, &dev_attr_ud_version))
 668                         goto fail;
 669         if (ud->flags & UNIT_DIRECTORY_VENDOR_ID) {
 670                 if (device_create_file(dev, &dev_attr_ud_vendor_id))
 671                         goto fail;
 672                 if (ud->vendor_name_kv &&
 673                     device_create_file(dev, &dev_attr_ud_vendor_name_kv))
 674                         goto fail;
 675         }
 676         if (ud->flags & UNIT_DIRECTORY_MODEL_ID) {
 677                 if (device_create_file(dev, &dev_attr_ud_model_id))
 678                         goto fail;
 679                 if (ud->model_name_kv &&
 680                     device_create_file(dev, &dev_attr_ud_model_name_kv))
 681                         goto fail;
 682         }
 683         return;
 684 fail:
 685         HPSB_ERR("Failed to add sysfs attributes for unit %s",
 686                  ud->device.bus_id);
 687 }
 688
 689
 690 static int nodemgr_bus_match(struct device * dev, struct device_driver * drv)
 691 {
 692         struct hpsb_protocol_driver *driver;
 693         struct unit_directory *ud;
 694         struct ieee1394_device_id *id;
 695
 696         /* We only match unit directories */
 697         if (dev->platform_data != &nodemgr_ud_platform_data)
 698                 return 0;
 699
 700         ud = container_of(dev, struct unit_directory, device);
 701         if (ud->ne->in_limbo || ud->ignore_driver)
 702                 return 0;
 703
 704         /* We only match drivers of type hpsb_protocol_driver */
 705         if (drv == &nodemgr_mid_layer_driver)
 706                 return 0;
 707
 708         driver = container_of(drv, struct hpsb_protocol_driver, driver);
 709         for (id = driver->id_table; id->match_flags != 0; id++) {
 710                 if ((id->match_flags & IEEE1394_MATCH_VENDOR_ID) &&
 711                     id->vendor_id != ud->vendor_id)
 712                         continue;
 713
 714                 if ((id->match_flags & IEEE1394_MATCH_MODEL_ID) &&
 715                     id->model_id != ud->model_id)
 716                         continue;
 717
 718                 if ((id->match_flags & IEEE1394_MATCH_SPECIFIER_ID) &&
 719                     id->specifier_id != ud->specifier_id)
 720                         continue;
 721
 722                 if ((id->match_flags & IEEE1394_MATCH_VERSION) &&
 723                     id->version != ud->version)
 724                         continue;
 725
 726                 return 1;
 727         }
 728
 729         return 0;
 730 }
 731
 732
 733 static DEFINE_MUTEX(nodemgr_serialize_remove_uds);
 734
 735 static void nodemgr_remove_uds(struct node_entry *ne)
 736 {
 737         struct class_device *cdev;
 738         struct unit_directory *tmp, *ud;
 739
 740         /* Iteration over nodemgr_ud_class.children has to be protected by
 741          * nodemgr_ud_class.sem, but class_device_unregister() will eventually
 742          * take nodemgr_ud_class.sem too. Therefore pick out one ud at a time,
 743          * release the semaphore, and then unregister the ud. Since this code
 744          * may be called from other contexts besides the knodemgrds, protect the
 745          * gap after release of the semaphore by nodemgr_serialize_remove_uds.
 746          */
 747         mutex_lock(&nodemgr_serialize_remove_uds);
 748         for (;;) {
 749                 ud = NULL;
 750                 down(&nodemgr_ud_class.sem);
 751                 list_for_each_entry(cdev, &nodemgr_ud_class.children, node) {
 752                         tmp = container_of(cdev, struct unit_directory,
 753                                            class_dev);
 754                         if (tmp->ne == ne) {
 755                                 ud = tmp;
 756                                 break;
 757                         }
 758                 }
 759                 up(&nodemgr_ud_class.sem);
 760                 if (ud == NULL)
 761                         break;
 762                 class_device_unregister(&ud->class_dev);
 763                 device_unregister(&ud->device);
 764         }
 765         mutex_unlock(&nodemgr_serialize_remove_uds);
 766 }
 767
 768
 769 static void nodemgr_remove_ne(struct node_entry *ne)
 770 {
 771         struct device *dev;
 772
 773         dev = get_device(&ne->device);
 774         if (!dev)
 775                 return;
 776
 777         HPSB_DEBUG("Node removed: ID:BUS[" NODE_BUS_FMT "]  GUID[%016Lx]",
 778                    NODE_BUS_ARGS(ne->host, ne->nodeid), (unsigned long long)ne->guid);
 779
 780         nodemgr_remove_uds(ne);
 781
 782         class_device_unregister(&ne->class_dev);
 783         device_unregister(dev);
 784
 785         put_device(dev);
 786 }
 787
 788 static int __nodemgr_remove_host_dev(struct device *dev, void *data)
 789 {
 790         nodemgr_remove_ne(container_of(dev, struct node_entry, device));
 791         return 0;
 792 }
 793
 794 static void nodemgr_remove_host_dev(struct device *dev)
 795 {
 796         WARN_ON(device_for_each_child(dev, NULL, __nodemgr_remove_host_dev));
 797         sysfs_remove_link(&dev->kobj, "irm_id");
 798         sysfs_remove_link(&dev->kobj, "busmgr_id");
 799         sysfs_remove_link(&dev->kobj, "host_id");
 800 }
 801
 802
 803 static void nodemgr_update_bus_options(struct node_entry *ne)
 804 {
 805 #ifdef CONFIG_IEEE1394_VERBOSEDEBUG
 806         static const u16 mr[] = { 4, 64, 1024, 0};
 807 #endif
 808         quadlet_t busoptions = be32_to_cpu(ne->csr->bus_info_data[2]);
 809
 810         ne->busopt.irmc         = (busoptions >> 31) & 1;
 811         ne->busopt.cmc          = (busoptions >> 30) & 1;
 812         ne->busopt.isc          = (busoptions >> 29) & 1;
 813         ne->busopt.bmc          = (busoptions >> 28) & 1;
 814         ne->busopt.pmc          = (busoptions >> 27) & 1;
 815         ne->busopt.cyc_clk_acc  = (busoptions >> 16) & 0xff;
 816         ne->busopt.max_rec      = 1 << (((busoptions >> 12) & 0xf) + 1);
 817         ne->busopt.max_rom      = (busoptions >> 8) & 0x3;
 818         ne->busopt.generation   = (busoptions >> 4) & 0xf;
 819         ne->busopt.lnkspd       = busoptions & 0x7;
 820
 821         HPSB_VERBOSE("NodeMgr: raw=0x%08x irmc=%d cmc=%d isc=%d bmc=%d pmc=%d "
 822                      "cyc_clk_acc=%d max_rec=%d max_rom=%d gen=%d lspd=%d",
 823                      busoptions, ne->busopt.irmc, ne->busopt.cmc,
 824                      ne->busopt.isc, ne->busopt.bmc, ne->busopt.pmc,
 825                      ne->busopt.cyc_clk_acc, ne->busopt.max_rec,
 826                      mr[ne->busopt.max_rom],
 827                      ne->busopt.generation, ne->busopt.lnkspd);
 828 }
 829
 830
 831 static struct node_entry *nodemgr_create_node(octlet_t guid, struct csr1212_csr *csr,
 832                                               struct host_info *hi, nodeid_t nodeid,
 833                                               unsigned int generation)
 834 {
 835         struct hpsb_host *host = hi->host;
 836         struct node_entry *ne;
 837
 838         ne = kzalloc(sizeof(*ne), GFP_KERNEL);
 839         if (!ne)
 840                 goto fail_alloc;
 841
 842         ne->host = host;
 843         ne->nodeid = nodeid;
 844         ne->generation = generation;
 845         ne->needs_probe = 1;
 846
 847         ne->guid = guid;
 848         ne->guid_vendor_id = (guid >> 40) & 0xffffff;
 849         ne->csr = csr;
 850
 851         memcpy(&ne->device, &nodemgr_dev_template_ne,
 852                sizeof(ne->device));
 853         ne->device.parent = &host->device;
 854         snprintf(ne->device.bus_id, BUS_ID_SIZE, "%016Lx",
 855                  (unsigned long long)(ne->guid));
 856
 857         ne->class_dev.dev = &ne->device;
 858         ne->class_dev.class = &nodemgr_ne_class;
 859         snprintf(ne->class_dev.class_id, BUS_ID_SIZE, "%016Lx",
 860                  (unsigned long long)(ne->guid));
 861
 862         if (device_register(&ne->device))
 863                 goto fail_devreg;
 864         if (class_device_register(&ne->class_dev))
 865                 goto fail_classdevreg;
 866         get_device(&ne->device);
 867
 868         nodemgr_create_ne_dev_files(ne);
 869
 870         nodemgr_update_bus_options(ne);
 871
 872         HPSB_DEBUG("%s added: ID:BUS[" NODE_BUS_FMT "]  GUID[%016Lx]",
 873                    (host->node_id == nodeid) ? "Host" : "Node",
 874                    NODE_BUS_ARGS(host, nodeid), (unsigned long long)guid);
 875
 876         return ne;
 877
 878 fail_classdevreg:
 879         device_unregister(&ne->device);
 880 fail_devreg:
 881         kfree(ne);
 882 fail_alloc:
 883         HPSB_ERR("Failed to create node ID:BUS[" NODE_BUS_FMT "]  GUID[%016Lx]",
 884                  NODE_BUS_ARGS(host, nodeid), (unsigned long long)guid);
 885
 886         return NULL;
 887 }
 888
 889
 890 static struct node_entry *find_entry_by_guid(u64 guid)
 891 {
 892         struct class_device *cdev;
 893         struct node_entry *ne, *ret_ne = NULL;
 894
 895         down(&nodemgr_ne_class.sem);
 896         list_for_each_entry(cdev, &nodemgr_ne_class.children, node) {
 897                 ne = container_of(cdev, struct node_entry, class_dev);
 898
 899                 if (ne->guid == guid) {
 900                         ret_ne = ne;
 901                         break;
 902                 }
 903         }
 904         up(&nodemgr_ne_class.sem);
 905
 906         return ret_ne;
 907 }
 908
 909
 910 static struct node_entry *find_entry_by_nodeid(struct hpsb_host *host,
 911                                                nodeid_t nodeid)
 912 {
 913         struct class_device *cdev;
 914         struct node_entry *ne, *ret_ne = NULL;
 915
 916         down(&nodemgr_ne_class.sem);
 917         list_for_each_entry(cdev, &nodemgr_ne_class.children, node) {
 918                 ne = container_of(cdev, struct node_entry, class_dev);
 919
 920                 if (ne->host == host && ne->nodeid == nodeid) {
 921                         ret_ne = ne;
 922                         break;
 923                 }
 924         }
 925         up(&nodemgr_ne_class.sem);
 926
 927         return ret_ne;
 928 }
 929
 930
 931 static void nodemgr_register_device(struct node_entry *ne,
 932         struct unit_directory *ud, struct device *parent)
 933 {
 934         memcpy(&ud->device, &nodemgr_dev_template_ud,
 935                sizeof(ud->device));
 936
 937         ud->device.parent = parent;
 938
 939         snprintf(ud->device.bus_id, BUS_ID_SIZE, "%s-%u",
 940                  ne->device.bus_id, ud->id);
 941
 942         ud->class_dev.dev = &ud->device;
 943         ud->class_dev.class = &nodemgr_ud_class;
 944         snprintf(ud->class_dev.class_id, BUS_ID_SIZE, "%s-%u",
 945                  ne->device.bus_id, ud->id);
 946
 947         if (device_register(&ud->device))
 948                 goto fail_devreg;
 949         if (class_device_register(&ud->class_dev))
 950                 goto fail_classdevreg;
 951         get_device(&ud->device);
 952
 953         nodemgr_create_ud_dev_files(ud);
 954
 955         return;
 956
 957 fail_classdevreg:
 958         device_unregister(&ud->device);
 959 fail_devreg:
 960         HPSB_ERR("Failed to create unit %s", ud->device.bus_id);
 961 }
 962
 963
 964 /* This implementation currently only scans the config rom and its
 965  * immediate unit directories looking for software_id and
 966  * software_version entries, in order to get driver autoloading working. */
 967 static struct unit_directory *nodemgr_process_unit_directory
 968         (struct host_info *hi, struct node_entry *ne, struct csr1212_keyval *ud_kv,
 969          unsigned int *id, struct unit_directory *parent)
 970 {
 971         struct unit_directory *ud;
 972         struct unit_directory *ud_child = NULL;
 973         struct csr1212_dentry *dentry;
 974         struct csr1212_keyval *kv;
 975         u8 last_key_id = 0;
 976
 977         ud = kzalloc(sizeof(*ud), GFP_KERNEL);
 978         if (!ud)
 979                 goto unit_directory_error;
 980
 981         ud->ne = ne;
 982         ud->ignore_driver = ignore_drivers;
 983         ud->address = ud_kv->offset + CSR1212_CONFIG_ROM_SPACE_BASE;
 984         ud->ud_kv = ud_kv;
 985         ud->id = (*id)++;
 986
 987         csr1212_for_each_dir_entry(ne->csr, kv, ud_kv, dentry) {
 988                 switch (kv->key.id) {
 989                 case CSR1212_KV_ID_VENDOR:
 990                         if (kv->key.type == CSR1212_KV_TYPE_IMMEDIATE) {
 991                                 ud->vendor_id = kv->value.immediate;
 992                                 ud->flags |= UNIT_DIRECTORY_VENDOR_ID;
 993                         }
 994                         break;
 995
 996                 case CSR1212_KV_ID_MODEL:
 997                         ud->model_id = kv->value.immediate;
 998                         ud->flags |= UNIT_DIRECTORY_MODEL_ID;
 999                         break;
1000
1001                 case CSR1212_KV_ID_SPECIFIER_ID:
1002                         ud->specifier_id = kv->value.immediate;
1003                         ud->flags |= UNIT_DIRECTORY_SPECIFIER_ID;
1004                         break;
1005
1006                 case CSR1212_KV_ID_VERSION:
1007                         ud->version = kv->value.immediate;
1008                         ud->flags |= UNIT_DIRECTORY_VERSION;
1009                         break;
1010
1011                 case CSR1212_KV_ID_DESCRIPTOR:
1012                         if (kv->key.type == CSR1212_KV_TYPE_LEAF &&
1013                             CSR1212_DESCRIPTOR_LEAF_TYPE(kv) == 0 &&
1014                             CSR1212_DESCRIPTOR_LEAF_SPECIFIER_ID(kv) == 0 &&
1015                             CSR1212_TEXTUAL_DESCRIPTOR_LEAF_WIDTH(kv) == 0 &&
1016                             CSR1212_TEXTUAL_DESCRIPTOR_LEAF_CHAR_SET(kv) == 0 &&
1017                             CSR1212_TEXTUAL_DESCRIPTOR_LEAF_LANGUAGE(kv) == 0) {
1018                                 switch (last_key_id) {
1019                                 case CSR1212_KV_ID_VENDOR:
1020                                         ud->vendor_name_kv = kv;
1021                                         csr1212_keep_keyval(kv);
1022                                         break;
1023
1024                                 case CSR1212_KV_ID_MODEL:
1025                                         ud->model_name_kv = kv;
1026                                         csr1212_keep_keyval(kv);
1027                                         break;
1028
1029                                 }
1030                         } /* else if (kv->key.type == CSR1212_KV_TYPE_DIRECTORY) ... */
1031                         break;
1032
1033                 case CSR1212_KV_ID_DEPENDENT_INFO:
1034                         /* Logical Unit Number */
1035                         if (kv->key.type == CSR1212_KV_TYPE_IMMEDIATE) {
1036                                 if (ud->flags & UNIT_DIRECTORY_HAS_LUN) {
1037                                         ud_child = kmemdup(ud, sizeof(*ud_child), GFP_KERNEL);
1038                                         if (!ud_child)
1039                                                 goto unit_directory_error;
1040                                         nodemgr_register_device(ne, ud_child, &ne->device);
1041                                         ud_child = NULL;
1042
1043                                         ud->id = (*id)++;
1044                                 }
1045                                 ud->lun = kv->value.immediate;
1046                                 ud->flags |= UNIT_DIRECTORY_HAS_LUN;
1047
1048                         /* Logical Unit Directory */
1049                         } else if (kv->key.type == CSR1212_KV_TYPE_DIRECTORY) {
1050                                 /* This should really be done in SBP2 as this is
1051                                  * doing SBP2 specific parsing.
1052                                  */
1053
1054                                 /* first register the parent unit */
1055                                 ud->flags |= UNIT_DIRECTORY_HAS_LUN_DIRECTORY;
1056                                 if (ud->device.bus != &ieee1394_bus_type)
1057                                         nodemgr_register_device(ne, ud, &ne->device);
1058
1059                                 /* process the child unit */
1060                                 ud_child = nodemgr_process_unit_directory(hi, ne, kv, id, ud);
1061
1062                                 if (ud_child == NULL)
1063                                         break;
1064
1065                                 /* inherit unspecified values, the driver core picks it up */
1066                                 if ((ud->flags & UNIT_DIRECTORY_MODEL_ID) &&
1067                                     !(ud_child->flags & UNIT_DIRECTORY_MODEL_ID))
1068                                 {
1069                                         ud_child->flags |=  UNIT_DIRECTORY_MODEL_ID;
1070                                         ud_child->model_id = ud->model_id;
1071                                 }
1072                                 if ((ud->flags & UNIT_DIRECTORY_SPECIFIER_ID) &&
1073                                     !(ud_child->flags & UNIT_DIRECTORY_SPECIFIER_ID))
1074                                 {
1075                                         ud_child->flags |=  UNIT_DIRECTORY_SPECIFIER_ID;
1076                                         ud_child->specifier_id = ud->specifier_id;
1077                                 }
1078                                 if ((ud->flags & UNIT_DIRECTORY_VERSION) &&
1079                                     !(ud_child->flags & UNIT_DIRECTORY_VERSION))
1080                                 {
1081                                         ud_child->flags |=  UNIT_DIRECTORY_VERSION;
1082                                         ud_child->version = ud->version;
1083                                 }
1084
1085                                 /* register the child unit */
1086                                 ud_child->flags |= UNIT_DIRECTORY_LUN_DIRECTORY;
1087                                 nodemgr_register_device(ne, ud_child, &ud->device);
1088                         }
1089
1090                         break;
1091
1092                 default:
1093                         break;
1094                 }
1095                 last_key_id = kv->key.id;
1096         }
1097
1098         /* do not process child units here and only if not already registered */
1099         if (!parent && ud->device.bus != &ieee1394_bus_type)
1100                 nodemgr_register_device(ne, ud, &ne->device);
1101
1102         return ud;
1103
1104 unit_directory_error:
1105         kfree(ud);
1106         return NULL;
1107 }
1108
1109
1110 static void nodemgr_process_root_directory(struct host_info *hi, struct node_entry *ne)
1111 {
1112         unsigned int ud_id = 0;
1113         struct csr1212_dentry *dentry;
1114         struct csr1212_keyval *kv;
1115         u8 last_key_id = 0;
1116
1117         ne->needs_probe = 0;
1118
1119         csr1212_for_each_dir_entry(ne->csr, kv, ne->csr->root_kv, dentry) {
1120                 switch (kv->key.id) {
1121                 case CSR1212_KV_ID_VENDOR:
1122                         ne->vendor_id = kv->value.immediate;
1123                         break;
1124
1125                 case CSR1212_KV_ID_NODE_CAPABILITIES:
1126                         ne->capabilities = kv->value.immediate;
1127                         break;
1128
1129                 case CSR1212_KV_ID_UNIT:
1130                         nodemgr_process_unit_directory(hi, ne, kv, &ud_id, NULL);
1131                         break;
1132
1133                 case CSR1212_KV_ID_DESCRIPTOR:
1134                         if (last_key_id == CSR1212_KV_ID_VENDOR) {
1135                                 if (kv->key.type == CSR1212_KV_TYPE_LEAF &&
1136                                     CSR1212_DESCRIPTOR_LEAF_TYPE(kv) == 0 &&
1137                                     CSR1212_DESCRIPTOR_LEAF_SPECIFIER_ID(kv) == 0 &&
1138                                     CSR1212_TEXTUAL_DESCRIPTOR_LEAF_WIDTH(kv) == 0 &&
1139                                     CSR1212_TEXTUAL_DESCRIPTOR_LEAF_CHAR_SET(kv) == 0 &&
1140                                     CSR1212_TEXTUAL_DESCRIPTOR_LEAF_LANGUAGE(kv) == 0) {
1141                                         ne->vendor_name_kv = kv;
1142                                         csr1212_keep_keyval(kv);
1143                                 }
1144                         }
1145                         break;
1146                 }
1147                 last_key_id = kv->key.id;
1148         }
1149
1150         if (ne->vendor_name_kv &&
1151             device_create_file(&ne->device, &dev_attr_ne_vendor_name_kv))
1152                 goto fail;
1153         return;
1154 fail:
1155         HPSB_ERR("Failed to add sysfs attribute for node %016Lx",
1156                  (unsigned long long)ne->guid);
1157 }
1158
1159 #ifdef CONFIG_HOTPLUG
1160
1161 static int nodemgr_uevent(struct class_device *cdev, char **envp, int num_envp,
1162                           char *buffer, int buffer_size)
1163 {
1164         struct unit_directory *ud;
1165         int i = 0;
1166         int length = 0;
1167         /* ieee1394:venNmoNspNverN */
1168         char buf[8 + 1 + 3 + 8 + 2 + 8 + 2 + 8 + 3 + 8 + 1];
1169
1170         if (!cdev)
1171                 return -ENODEV;
1172
1173         ud = container_of(cdev, struct unit_directory, class_dev);
1174
1175         if (ud->ne->in_limbo || ud->ignore_driver)
1176                 return -ENODEV;
1177
1178 #define PUT_ENVP(fmt,val)                                       \
1179 do {                                                            \
1180         int printed;                                            \
1181         envp[i++] = buffer;                                     \
1182         printed = snprintf(buffer, buffer_size - length,        \
1183                            fmt, val);                           \
1184         if ((buffer_size - (length+printed) <= 0) || (i >= num_envp))   \
1185                 return -ENOMEM;                                 \
1186         length += printed+1;                                    \
1187         buffer += printed+1;                                    \
1188 } while (0)
1189
1190         PUT_ENVP("VENDOR_ID=%06x", ud->vendor_id);
1191         PUT_ENVP("MODEL_ID=%06x", ud->model_id);
1192         PUT_ENVP("GUID=%016Lx", (unsigned long long)ud->ne->guid);
1193         PUT_ENVP("SPECIFIER_ID=%06x", ud->specifier_id);
1194         PUT_ENVP("VERSION=%06x", ud->version);
1195         snprintf(buf, sizeof(buf), "ieee1394:ven%08Xmo%08Xsp%08Xver%08X",
1196                         ud->vendor_id,
1197                         ud->model_id,
1198                         ud->specifier_id,
1199                         ud->version);
1200         PUT_ENVP("MODALIAS=%s", buf);
1201
1202 #undef PUT_ENVP
1203
1204         envp[i] = NULL;
1205
1206         return 0;
1207 }
1208
1209 #else
1210
1211 static int nodemgr_uevent(struct class_device *cdev, char **envp, int num_envp,
1212                           char *buffer, int buffer_size)
1213 {
1214         return -ENODEV;
1215 }
1216
1217 #endif /* CONFIG_HOTPLUG */
1218
1219
1220 int __hpsb_register_protocol(struct hpsb_protocol_driver *drv,
1221                              struct module *owner)
1222 {
1223         int error;
1224
1225         drv->driver.bus = &ieee1394_bus_type;
1226         drv->driver.owner = owner;
1227         drv->driver.name = drv->name;
1228
1229         /* This will cause a probe for devices */
1230         error = driver_register(&drv->driver);
1231         if (!error)
1232                 nodemgr_create_drv_files(drv);
1233         return error;
1234 }
1235
1236 void hpsb_unregister_protocol(struct hpsb_protocol_driver *driver)
1237 {
1238         nodemgr_remove_drv_files(driver);
1239         /* This will subsequently disconnect all devices that our driver
1240          * is attached to. */
1241         driver_unregister(&driver->driver);
1242 }
1243
1244
1245 /*
1246  * This function updates nodes that were present on the bus before the
1247  * reset and still are after the reset.  The nodeid and the config rom
1248  * may have changed, and the drivers managing this device must be
1249  * informed that this device just went through a bus reset, to allow
1250  * the to take whatever actions required.
1251  */
1252 static void nodemgr_update_node(struct node_entry *ne, struct csr1212_csr *csr,
1253                                 struct host_info *hi, nodeid_t nodeid,
1254                                 unsigned int generation)
1255 {
1256         if (ne->nodeid != nodeid) {
1257                 HPSB_DEBUG("Node changed: " NODE_BUS_FMT " -> " NODE_BUS_FMT,
1258                            NODE_BUS_ARGS(ne->host, ne->nodeid),
1259                            NODE_BUS_ARGS(ne->host, nodeid));
1260                 ne->nodeid = nodeid;
1261         }
1262
1263         if (ne->busopt.generation != ((be32_to_cpu(csr->bus_info_data[2]) >> 4) & 0xf)) {
1264                 kfree(ne->csr->private);
1265                 csr1212_destroy_csr(ne->csr);
1266                 ne->csr = csr;
1267
1268                 /* If the node's configrom generation has changed, we
1269                  * unregister all the unit directories. */
1270                 nodemgr_remove_uds(ne);
1271
1272                 nodemgr_update_bus_options(ne);
1273
1274                 /* Mark the node as new, so it gets re-probed */
1275                 ne->needs_probe = 1;
1276         } else {
1277                 /* old cache is valid, so update its generation */
1278                 struct nodemgr_csr_info *ci = ne->csr->private;
1279                 ci->generation = generation;
1280                 /* free the partially filled now unneeded new cache */
1281                 kfree(csr->private);
1282                 csr1212_destroy_csr(csr);
1283         }
1284
1285         if (ne->in_limbo)
1286                 nodemgr_resume_ne(ne);
1287
1288         /* Mark the node current */
1289         ne->generation = generation;
1290 }
1291
1292
1293
1294 static void nodemgr_node_scan_one(struct host_info *hi,
1295                                   nodeid_t nodeid, int generation)
1296 {
1297         struct hpsb_host *host = hi->host;
1298         struct node_entry *ne;
1299         octlet_t guid;
1300         struct csr1212_csr *csr;
1301         struct nodemgr_csr_info *ci;
1302         u8 *speed;
1303
1304         ci = kmalloc(sizeof(*ci), GFP_KERNEL);
1305         if (!ci)
1306                 return;
1307
1308         ci->host = host;
1309         ci->nodeid = nodeid;
1310         ci->generation = generation;
1311
1312         /* Prepare for speed probe which occurs when reading the ROM */
1313         speed = &(host->speed[NODEID_TO_NODE(nodeid)]);
1314         if (*speed > host->csr.lnk_spd)
1315                 *speed = host->csr.lnk_spd;
1316         ci->speed_unverified = *speed > IEEE1394_SPEED_100;
1317
1318         /* We need to detect when the ConfigROM's generation has changed,
1319          * so we only update the node's info when it needs to be.  */
1320
1321         csr = csr1212_create_csr(&nodemgr_csr_ops, 5 * sizeof(quadlet_t), ci);
1322         if (!csr || csr1212_parse_csr(csr) != CSR1212_SUCCESS) {
1323                 HPSB_ERR("Error parsing configrom for node " NODE_BUS_FMT,
1324                          NODE_BUS_ARGS(host, nodeid));
1325                 if (csr)
1326                         csr1212_destroy_csr(csr);
1327                 kfree(ci);
1328                 return;
1329         }
1330
1331         if (csr->bus_info_data[1] != IEEE1394_BUSID_MAGIC) {
1332                 /* This isn't a 1394 device, but we let it slide. There
1333                  * was a report of a device with broken firmware which
1334                  * reported '2394' instead of '1394', which is obviously a
1335                  * mistake. One would hope that a non-1394 device never
1336                  * gets connected to Firewire bus. If someone does, we
1337                  * shouldn't be held responsible, so we'll allow it with a
1338                  * warning.  */
1339                 HPSB_WARN("Node " NODE_BUS_FMT " has invalid busID magic [0x%08x]",
1340                           NODE_BUS_ARGS(host, nodeid), csr->bus_info_data[1]);
1341         }
1342
1343         guid = ((u64)be32_to_cpu(csr->bus_info_data[3]) << 32) | be32_to_cpu(csr->bus_info_data[4]);
1344         ne = find_entry_by_guid(guid);
1345
1346         if (ne && ne->host != host && ne->in_limbo) {
1347                 /* Must have moved this device from one host to another */
1348                 nodemgr_remove_ne(ne);
1349                 ne = NULL;
1350         }
1351
1352         if (!ne)
1353                 nodemgr_create_node(guid, csr, hi, nodeid, generation);
1354         else
1355                 nodemgr_update_node(ne, csr, hi, nodeid, generation);
1356 }
1357
1358
1359 static void nodemgr_node_scan(struct host_info *hi, int generation)
1360 {
1361         int count;
1362         struct hpsb_host *host = hi->host;
1363         struct selfid *sid = (struct selfid *)host->topology_map;
1364         nodeid_t nodeid = LOCAL_BUS;
1365
1366         /* Scan each node on the bus */
1367         for (count = host->selfid_count; count; count--, sid++) {
1368                 if (sid->extended)
1369                         continue;
1370
1371                 if (!sid->link_active) {
1372                         nodeid++;
1373                         continue;
1374                 }
1375                 nodemgr_node_scan_one(hi, nodeid++, generation);
1376         }
1377 }
1378
1379
1380 static void nodemgr_suspend_ne(struct node_entry *ne)
1381 {
1382         struct class_device *cdev;
1383         struct unit_directory *ud;
1384
1385         HPSB_DEBUG("Node suspended: ID:BUS[" NODE_BUS_FMT "]  GUID[%016Lx]",
1386                    NODE_BUS_ARGS(ne->host, ne->nodeid), (unsigned long long)ne->guid);
1387
1388         ne->in_limbo = 1;
1389         WARN_ON(device_create_file(&ne->device, &dev_attr_ne_in_limbo));
1390
1391         down(&nodemgr_ud_class.sem);
1392         list_for_each_entry(cdev, &nodemgr_ud_class.children, node) {
1393                 ud = container_of(cdev, struct unit_directory, class_dev);
1394                 if (ud->ne != ne)
1395                         continue;
1396
1397                 down_write(&ieee1394_bus_type.subsys.rwsem);
1398                 if (ud->device.driver &&
1399                     (!ud->device.driver->suspend ||
1400                       ud->device.driver->suspend(&ud->device, PMSG_SUSPEND)))
1401                         device_release_driver(&ud->device);
1402                 up_write(&ieee1394_bus_type.subsys.rwsem);
1403         }
1404         up(&nodemgr_ud_class.sem);
1405 }
1406
1407
1408 static void nodemgr_resume_ne(struct node_entry *ne)
1409 {
1410         struct class_device *cdev;
1411         struct unit_directory *ud;
1412
1413         ne->in_limbo = 0;
1414         device_remove_file(&ne->device, &dev_attr_ne_in_limbo);
1415
1416         down(&nodemgr_ud_class.sem);
1417         list_for_each_entry(cdev, &nodemgr_ud_class.children, node) {
1418                 ud = container_of(cdev, struct unit_directory, class_dev);
1419                 if (ud->ne != ne)
1420                         continue;
1421
1422                 down_read(&ieee1394_bus_type.subsys.rwsem);
1423                 if (ud->device.driver && ud->device.driver->resume)
1424                         ud->device.driver->resume(&ud->device);
1425                 up_read(&ieee1394_bus_type.subsys.rwsem);
1426         }
1427         up(&nodemgr_ud_class.sem);
1428
1429         HPSB_DEBUG("Node resumed: ID:BUS[" NODE_BUS_FMT "]  GUID[%016Lx]",
1430                    NODE_BUS_ARGS(ne->host, ne->nodeid), (unsigned long long)ne->guid);
1431 }
1432
1433
1434 static void nodemgr_update_pdrv(struct node_entry *ne)
1435 {
1436         struct unit_directory *ud;
1437         struct hpsb_protocol_driver *pdrv;
1438         struct class_device *cdev;
1439
1440         down(&nodemgr_ud_class.sem);
1441         list_for_each_entry(cdev, &nodemgr_ud_class.children, node) {
1442                 ud = container_of(cdev, struct unit_directory, class_dev);
1443                 if (ud->ne != ne)
1444                         continue;
1445
1446                 down_write(&ieee1394_bus_type.subsys.rwsem);
1447                 if (ud->device.driver) {
1448                         pdrv = container_of(ud->device.driver,
1449                                             struct hpsb_protocol_driver,
1450                                             driver);
1451                         if (pdrv->update && pdrv->update(ud))
1452                                 device_release_driver(&ud->device);
1453                 }
1454                 up_write(&ieee1394_bus_type.subsys.rwsem);
1455         }
1456         up(&nodemgr_ud_class.sem);
1457 }
1458
1459
1460 /* Write the BROADCAST_CHANNEL as per IEEE1394a 8.3.2.3.11 and 8.4.2.3.  This
1461  * seems like an optional service but in the end it is practically mandatory
1462  * as a consequence of these clauses.
1463  *
1464  * Note that we cannot do a broadcast write to all nodes at once because some
1465  * pre-1394a devices would hang. */
1466 static void nodemgr_irm_write_bc(struct node_entry *ne, int generation)
1467 {
1468         const u64 bc_addr = (CSR_REGISTER_BASE | CSR_BROADCAST_CHANNEL);
1469         quadlet_t bc_remote, bc_local;
1470         int error;
1471
1472         if (!ne->host->is_irm || ne->generation != generation ||
1473             ne->nodeid == ne->host->node_id)
1474                 return;
1475
1476         bc_local = cpu_to_be32(ne->host->csr.broadcast_channel);
1477
1478         /* Check if the register is implemented and 1394a compliant. */
1479         error = hpsb_read(ne->host, ne->nodeid, generation, bc_addr, &bc_remote,
1480                           sizeof(bc_remote));
1481         if (!error && bc_remote & cpu_to_be32(0x80000000) &&
1482             bc_remote != bc_local)
1483                 hpsb_node_write(ne, bc_addr, &bc_local, sizeof(bc_local));
1484 }
1485
1486
1487 static void nodemgr_probe_ne(struct host_info *hi, struct node_entry *ne, int generation)
1488 {
1489         struct device *dev;
1490
1491         if (ne->host != hi->host || ne->in_limbo)
1492                 return;
1493
1494         dev = get_device(&ne->device);
1495         if (!dev)
1496                 return;
1497
1498         nodemgr_irm_write_bc(ne, generation);
1499
1500         /* If "needs_probe", then this is either a new or changed node we
1501          * rescan totally. If the generation matches for an existing node
1502          * (one that existed prior to the bus reset) we send update calls
1503          * down to the drivers. Otherwise, this is a dead node and we
1504          * suspend it. */
1505         if (ne->needs_probe)
1506                 nodemgr_process_root_directory(hi, ne);
1507         else if (ne->generation == generation)
1508                 nodemgr_update_pdrv(ne);
1509         else
1510                 nodemgr_suspend_ne(ne);
1511
1512         put_device(dev);
1513 }
1514
1515
1516 static void nodemgr_node_probe(struct host_info *hi, int generation)
1517 {
1518         struct hpsb_host *host = hi->host;
1519         struct class_device *cdev;
1520         struct node_entry *ne;
1521
1522         /* Do some processing of the nodes we've probed. This pulls them
1523          * into the sysfs layer if needed, and can result in processing of
1524          * unit-directories, or just updating the node and it's
1525          * unit-directories.
1526          *
1527          * Run updates before probes. Usually, updates are time-critical
1528          * while probes are time-consuming. (Well, those probes need some
1529          * improvement...) */
1530
1531         down(&nodemgr_ne_class.sem);
1532         list_for_each_entry(cdev, &nodemgr_ne_class.children, node) {
1533                 ne = container_of(cdev, struct node_entry, class_dev);
1534                 if (!ne->needs_probe)
1535                         nodemgr_probe_ne(hi, ne, generation);
1536         }
1537         list_for_each_entry(cdev, &nodemgr_ne_class.children, node) {
1538                 ne = container_of(cdev, struct node_entry, class_dev);
1539                 if (ne->needs_probe)
1540                         nodemgr_probe_ne(hi, ne, generation);
1541         }
1542         up(&nodemgr_ne_class.sem);
1543
1544
1545         /* If we had a bus reset while we were scanning the bus, it is
1546          * possible that we did not probe all nodes.  In that case, we
1547          * skip the clean up for now, since we could remove nodes that
1548          * were still on the bus.  Another bus scan is pending which will
1549          * do the clean up eventually.
1550          *
1551          * Now let's tell the bus to rescan our devices. This may seem
1552          * like overhead, but the driver-model core will only scan a
1553          * device for a driver when either the device is added, or when a
1554          * new driver is added. A bus reset is a good reason to rescan
1555          * devices that were there before.  For example, an sbp2 device
1556          * may become available for login, if the host that held it was
1557          * just removed.  */
1558
1559         if (generation == get_hpsb_generation(host))
1560                 if (bus_rescan_devices(&ieee1394_bus_type))
1561                         HPSB_DEBUG("bus_rescan_devices had an error");
1562 }
1563
1564 static int nodemgr_send_resume_packet(struct hpsb_host *host)
1565 {
1566         struct hpsb_packet *packet;
1567         int error = -ENOMEM;
1568
1569         packet = hpsb_make_phypacket(host,
1570                         EXTPHYPACKET_TYPE_RESUME |
1571                         NODEID_TO_NODE(host->node_id) << PHYPACKET_PORT_SHIFT);
1572         if (packet) {
1573                 packet->no_waiter = 1;
1574                 packet->generation = get_hpsb_generation(host);
1575                 error = hpsb_send_packet(packet);
1576         }
1577         if (error)
1578                 HPSB_WARN("fw-host%d: Failed to broadcast resume packet",
1579                           host->id);
1580         return error;
1581 }
1582
1583 /* Perform a few high-level IRM responsibilities. */
1584 static int nodemgr_do_irm_duties(struct hpsb_host *host, int cycles)
1585 {
1586         quadlet_t bc;
1587
1588         /* if irm_id == -1 then there is no IRM on this bus */
1589         if (!host->is_irm || host->irm_id == (nodeid_t)-1)
1590                 return 1;
1591
1592         /* We are a 1394a-2000 compliant IRM. Set the validity bit. */
1593         host->csr.broadcast_channel |= 0x40000000;
1594
1595         /* If there is no bus manager then we should set the root node's
1596          * force_root bit to promote bus stability per the 1394
1597          * spec. (8.4.2.6) */
1598         if (host->busmgr_id == 0xffff && host->node_count > 1)
1599         {
1600                 u16 root_node = host->node_count - 1;
1601
1602                 /* get cycle master capability flag from root node */
1603                 if (host->is_cycmst ||
1604                     (!hpsb_read(host, LOCAL_BUS | root_node, get_hpsb_generation(host),
1605                                 (CSR_REGISTER_BASE + CSR_CONFIG_ROM + 2 * sizeof(quadlet_t)),
1606                                 &bc, sizeof(quadlet_t)) &&
1607                      be32_to_cpu(bc) & 1 << CSR_CMC_SHIFT))
1608                         hpsb_send_phy_config(host, root_node, -1);
1609                 else {
1610                         HPSB_DEBUG("The root node is not cycle master capable; "
1611                                    "selecting a new root node and resetting...");
1612
1613                         if (cycles >= 5) {
1614                                 /* Oh screw it! Just leave the bus as it is */
1615                                 HPSB_DEBUG("Stopping reset loop for IRM sanity");
1616                                 return 1;
1617                         }
1618
1619                         hpsb_send_phy_config(host, NODEID_TO_NODE(host->node_id), -1);
1620                         hpsb_reset_bus(host, LONG_RESET_FORCE_ROOT);
1621
1622                         return 0;
1623                 }
1624         }
1625
1626         /* Some devices suspend their ports while being connected to an inactive
1627          * host adapter, i.e. if connected before the low-level driver is
1628          * loaded.  They become visible either when physically unplugged and
1629          * replugged, or when receiving a resume packet.  Send one once. */
1630         if (!host->resume_packet_sent && !nodemgr_send_resume_packet(host))
1631                 host->resume_packet_sent = 1;
1632
1633         return 1;
1634 }
1635
1636 /* We need to ensure that if we are not the IRM, that the IRM node is capable of
1637  * everything we can do, otherwise issue a bus reset and try to become the IRM
1638  * ourselves. */
1639 static int nodemgr_check_irm_capability(struct hpsb_host *host, int cycles)
1640 {
1641         quadlet_t bc;
1642         int status;
1643
1644         if (hpsb_disable_irm || host->is_irm)
1645                 return 1;
1646
1647         status = hpsb_read(host, LOCAL_BUS | (host->irm_id),
1648                            get_hpsb_generation(host),
1649                            (CSR_REGISTER_BASE | CSR_BROADCAST_CHANNEL),
1650                            &bc, sizeof(quadlet_t));
1651
1652         if (status < 0 || !(be32_to_cpu(bc) & 0x80000000)) {
1653                 /* The current irm node does not have a valid BROADCAST_CHANNEL
1654                  * register and we do, so reset the bus with force_root set */
1655                 HPSB_DEBUG("Current remote IRM is not 1394a-2000 compliant, resetting...");
1656
1657                 if (cycles >= 5) {
1658                         /* Oh screw it! Just leave the bus as it is */
1659                         HPSB_DEBUG("Stopping reset loop for IRM sanity");
1660                         return 1;
1661                 }
1662
1663                 hpsb_send_phy_config(host, NODEID_TO_NODE(host->node_id), -1);
1664                 hpsb_reset_bus(host, LONG_RESET_FORCE_ROOT);
1665
1666                 return 0;
1667         }
1668
1669         return 1;
1670 }
1671
1672 static int nodemgr_host_thread(void *__hi)
1673 {
1674         struct host_info *hi = (struct host_info *)__hi;
1675         struct hpsb_host *host = hi->host;
1676         unsigned int g, generation = 0;
1677         int i, reset_cycles = 0;
1678
1679         /* Setup our device-model entries */
1680         nodemgr_create_host_dev_files(host);
1681
1682         for (;;) {
1683                 /* Sleep until next bus reset */
1684                 set_current_state(TASK_INTERRUPTIBLE);
1685                 if (get_hpsb_generation(host) == generation)
1686                         schedule();
1687                 __set_current_state(TASK_RUNNING);
1688
1689                 /* Thread may have been woken up to freeze or to exit */
1690                 if (try_to_freeze())
1691                         continue;
1692                 if (kthread_should_stop())
1693                         goto exit;
1694
1695                 if (mutex_lock_interruptible(&nodemgr_serialize)) {
1696                         if (try_to_freeze())
1697                                 continue;
1698                         goto exit;
1699                 }
1700
1701                 /* Pause for 1/4 second in 1/16 second intervals,
1702                  * to make sure things settle down. */
1703                 g = get_hpsb_generation(host);
1704                 for (i = 0; i < 4 ; i++) {
1705                         if (msleep_interruptible(63) || kthread_should_stop())
1706                                 goto unlock_exit;
1707
1708                         /* Now get the generation in which the node ID's we collect
1709                          * are valid.  During the bus scan we will use this generation
1710                          * for the read transactions, so that if another reset occurs
1711                          * during the scan the transactions will fail instead of
1712                          * returning bogus data. */
1713                         generation = get_hpsb_generation(host);
1714
1715                         /* If we get a reset before we are done waiting, then
1716                          * start the the waiting over again */
1717                         if (generation != g)
1718                                 g = generation, i = 0;
1719                 }
1720
1721                 if (!nodemgr_check_irm_capability(host, reset_cycles) ||
1722                     !nodemgr_do_irm_duties(host, reset_cycles)) {
1723                         reset_cycles++;
1724                         mutex_unlock(&nodemgr_serialize);
1725                         continue;
1726                 }
1727                 reset_cycles = 0;
1728
1729                 /* Scan our nodes to get the bus options and create node
1730                  * entries. This does not do the sysfs stuff, since that
1731                  * would trigger uevents and such, which is a bad idea at
1732                  * this point. */
1733                 nodemgr_node_scan(hi, generation);
1734
1735                 /* This actually does the full probe, with sysfs
1736                  * registration. */
1737                 nodemgr_node_probe(hi, generation);
1738
1739                 /* Update some of our sysfs symlinks */
1740                 nodemgr_update_host_dev_links(host);
1741
1742                 mutex_unlock(&nodemgr_serialize);
1743         }
1744 unlock_exit:
1745         mutex_unlock(&nodemgr_serialize);
1746 exit:
1747         HPSB_VERBOSE("NodeMgr: Exiting thread");
1748         return 0;
1749 }
1750
1751 int nodemgr_for_each_host(void *__data, int (*cb)(struct hpsb_host *, void *))
1752 {
1753         struct class_device *cdev;
1754         struct hpsb_host *host;
1755         int error = 0;
1756
1757         down(&hpsb_host_class.sem);
1758         list_for_each_entry(cdev, &hpsb_host_class.children, node) {
1759                 host = container_of(cdev, struct hpsb_host, class_dev);
1760
1761                 if ((error = cb(host, __data)))
1762                         break;
1763         }
1764         up(&hpsb_host_class.sem);
1765
1766         return error;
1767 }
1768
1769 /* The following four convenience functions use a struct node_entry
1770  * for addressing a node on the bus.  They are intended for use by any
1771  * process context, not just the nodemgr thread, so we need to be a
1772  * little careful when reading out the node ID and generation.  The
1773  * thing that can go wrong is that we get the node ID, then a bus
1774  * reset occurs, and then we read the generation.  The node ID is
1775  * possibly invalid, but the generation is current, and we end up
1776  * sending a packet to a the wrong node.
1777  *
1778  * The solution is to make sure we read the generation first, so that
1779  * if a reset occurs in the process, we end up with a stale generation
1780  * and the transactions will fail instead of silently using wrong node
1781  * ID's.
1782  */
1783
1784 void hpsb_node_fill_packet(struct node_entry *ne, struct hpsb_packet *pkt)
1785 {
1786         pkt->host = ne->host;
1787         pkt->generation = ne->generation;
1788         barrier();
1789         pkt->node_id = ne->nodeid;
1790 }
1791
1792 int hpsb_node_write(struct node_entry *ne, u64 addr,
1793                     quadlet_t *buffer, size_t length)
1794 {
1795         unsigned int generation = ne->generation;
1796
1797         barrier();
1798         return hpsb_write(ne->host, ne->nodeid, generation,
1799                           addr, buffer, length);
1800 }
1801
1802 static void nodemgr_add_host(struct hpsb_host *host)
1803 {
1804         struct host_info *hi;
1805
1806         hi = hpsb_create_hostinfo(&nodemgr_highlevel, host, sizeof(*hi));
1807         if (!hi) {
1808                 HPSB_ERR("NodeMgr: out of memory in add host");
1809                 return;
1810         }
1811         hi->host = host;
1812         hi->thread = kthread_run(nodemgr_host_thread, hi, "knodemgrd_%d",
1813                                  host->id);
1814         if (IS_ERR(hi->thread)) {
1815                 HPSB_ERR("NodeMgr: cannot start thread for host %d", host->id);
1816                 hpsb_destroy_hostinfo(&nodemgr_highlevel, host);
1817         }
1818 }
1819
1820 static void nodemgr_host_reset(struct hpsb_host *host)
1821 {
1822         struct host_info *hi = hpsb_get_hostinfo(&nodemgr_highlevel, host);
1823
1824         if (hi) {
1825                 HPSB_VERBOSE("NodeMgr: Processing reset for host %d", host->id);
1826                 wake_up_process(hi->thread);
1827         }
1828 }
1829
1830 static void nodemgr_remove_host(struct hpsb_host *host)
1831 {
1832         struct host_info *hi = hpsb_get_hostinfo(&nodemgr_highlevel, host);
1833
1834         if (hi) {
1835                 kthread_stop(hi->thread);
1836                 nodemgr_remove_host_dev(&host->device);
1837         }
1838 }
1839
1840 static struct hpsb_highlevel nodemgr_highlevel = {
1841         .name =         "Node manager",
1842         .add_host =     nodemgr_add_host,
1843         .host_reset =   nodemgr_host_reset,
1844         .remove_host =  nodemgr_remove_host,
1845 };
1846
1847 int init_ieee1394_nodemgr(void)
1848 {
1849         int error;
1850
1851         error = class_register(&nodemgr_ne_class);
1852         if (error)
1853                 return error;
1854
1855         error = class_register(&nodemgr_ud_class);
1856         if (error) {
1857                 class_unregister(&nodemgr_ne_class);
1858                 return error;
1859         }
1860         error = driver_register(&nodemgr_mid_layer_driver);
1861         hpsb_register_highlevel(&nodemgr_highlevel);
1862         return 0;
1863 }
1864
1865 void cleanup_ieee1394_nodemgr(void)
1866 {
1867         hpsb_unregister_highlevel(&nodemgr_highlevel);
1868
1869         class_unregister(&nodemgr_ud_class);
1870         class_unregister(&nodemgr_ne_class);
1871 }